#include<cstdio>
#include<cstdint>
#include <cstring>

#define GM_SM4_ENCRYPT 0
// 将const unsigned char *表示的数据转换为字
#ifndef GM_GET_UINT32_BE
#define GM_GET_UINT32_BE(n, b, i)                       \
{                                                       \
    (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
        | ( (uint32_t) (b)[(i) + 1] << 16 )             \
        | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
        | ( (uint32_t) (b)[(i) + 3]       );            \
}
#endif

//将字转换为const unsigned char *表示的数据
#ifndef GM_PUT_UINT32_BE
#define GM_PUT_UINT32_BE(n, b ,i)                       \
{                                                       \
    (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
    (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
    (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
    (b)[(i) + 3] = (unsigned char) ( (n)       );       \
}
#endif
unsigned char GM_SM4_SBOX[256] ={
    0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
    0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
    0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
    0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
    0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
    0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
    0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
    0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
    0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
    0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
    0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
    0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
    0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
    0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
    0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
    0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
};
#define  GM_SHL(x,n) (((x) & 0xFFFFFFFF) << (n % 32))
#define GM_CROL(x, n) (GM_SHL((x), n) | ((x) >> (32 - (n) % 32)))
#define GM_SM4_NON_LINEAR_OP(in, out) \
{                                                           \
    (out)  = ( GM_SM4_SBOX[ ((in) >> 24) & 0x0FF ] ) << 24; \
    (out) |= ( GM_SM4_SBOX[ ((in) >> 16) & 0x0FF ] ) << 16; \
    (out) |= ( GM_SM4_SBOX[ ((in) >> 8)  & 0x0FF ] ) << 8;  \
    (out) |= ( GM_SM4_SBOX[ (in)         & 0x0FF ] );       \
}
void gm_sm4_crypt(const unsigned char *key, int mode, const unsigned char *in, unsigned char *out);
unsigned int GM_SM4_FK[4] = {0xA3B1BAC6, 0x56AA3350, 0x677D9197, 0xB27022DC};
static void sm4_key_schedule(const unsigned char * key, unsigned int * rk);
unsigned int GM_SM4_CK[32] = {
    0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269, 0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
    0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249, 0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
    0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229, 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
    0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209, 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
};
void test_gm_sm4(const unsigned char * key, int mode,
		const unsigned char * input,
		const unsigned char * output_hex);
int main(int argc, char *argv[]) {
    // 检查命令行参数
    if (argc < 2) {
        printf("Usage: %s <gm_sm4_encrypt|gm_sm4_decrypt>\n", argv[0]);
        return 1;
    }

    // 如果命令是 "gm_sm4_encrypt"
    if (strcmp(argv[1], "gm_sm4_encrypt") == 0) {
        unsigned char key[16] = {
            0x6B, 0x8B, 0x45, 0x67, 0x32, 0x7B, 0x23, 0xC6,
            0x64, 0x3C, 0x98, 0x69, 0x66, 0x33, 0x48, 0x73
        };
        unsigned char input[16] = {
            0x74, 0xB0, 0xDC, 0x51, 0x19, 0x49, 0x5C, 0xFF,
            0x2A, 0xE8, 0x94, 0x4A, 0x62, 0x55, 0x58, 0xEC
        };

        // 调用测试函数进行加密
        test_gm_sm4(key, 0, input, reinterpret_cast<const unsigned char*>("C941785C2A15751A774DEFCAE01011D4"));
    }
    // 如果命令是 "gm_sm4_decrypt"
    else if (strcmp(argv[1], "gm_sm4_decrypt") == 0) {
        unsigned char key[16] = {
            0x6B, 0x8B, 0x45, 0x67, 0x32, 0x7B, 0x23, 0xC6,
            0x64, 0x3C, 0x98, 0x69, 0x66, 0x33, 0x48, 0x73
        };
        unsigned char input[16] = {
            0xC9, 0x41, 0x78, 0x5C, 0x2A, 0x15, 0x75, 0x1A,
            0x77, 0x4D, 0xEF, 0xCA, 0xE0, 0x10, 0x11, 0xD4
        };

        // 调用测试函数进行解密
        test_gm_sm4(key, 1, input, reinterpret_cast<const unsigned char*>("74B0DC5119495CFF2AE8944A625558EC"));
    }
    else {
        printf("Usage: %s <gm_sm4_encrypt|gm_sm4_decrypt>\n", argv[0]);
        return 1;
    }

    return 0;
}
void gm_sm4_crypt(const unsigned char *key, int mode, const unsigned char *in, unsigned char *out)
{
    unsigned int rk[32], X[36], tmp1, tmp2;
    int i;

    // 计算轮密钥rk，后面再讨论
    sm4_key_schedule(key, rk);

    GM_GET_UINT32_BE( X[0], in, 0);
    GM_GET_UINT32_BE( X[1], in, 4);
    GM_GET_UINT32_BE( X[2], in, 8);
    GM_GET_UINT32_BE( X[3], in, 12);

    for(i = 0; i < 32; i++)
    {
        tmp1 = X[i + 1] ^ X[i + 2] ^ X[i + 3] ^ rk[( (mode == GM_SM4_ENCRYPT) ? i : 31 - i )];

        // 非线性变换
        GM_SM4_NON_LINEAR_OP(tmp1, tmp2);

        // 线性变换
        unsigned int tt = (tmp2 ^ GM_CROL(tmp2, 2) ^ GM_CROL(tmp2, 10) ^ GM_CROL(tmp2, 18) ^ GM_CROL(tmp2, 24));

        X[i + 4] = X[i] ^ tt;
    }

    GM_PUT_UINT32_BE(X[35], out,  0);
    GM_PUT_UINT32_BE(X[34], out,  4);
    GM_PUT_UINT32_BE(X[33], out,  8);
    GM_PUT_UINT32_BE(X[32], out, 12);
}
static void sm4_key_schedule(const unsigned char * key, unsigned int * rk)
{
    unsigned int tmp1, tmp2, K[36];
    int i;

    // K0, K1, K2, K3
    GM_GET_UINT32_BE( K[0], key, 0);
    GM_GET_UINT32_BE( K[1], key, 4);
    GM_GET_UINT32_BE( K[2], key, 8);
    GM_GET_UINT32_BE( K[3], key, 12);

    K[0] ^= GM_SM4_FK[0];
    K[1] ^= GM_SM4_FK[1];
    K[2] ^= GM_SM4_FK[2];
    K[3] ^= GM_SM4_FK[3];

    // rki = Ki+4
    for(i = 0; i < 32; i++)
    {
        // non linear's input
        tmp1 = K[i + 1] ^ K[i + 2] ^ K[i + 3] ^ GM_SM4_CK[i];

        // non linear operation
        GM_SM4_NON_LINEAR_OP(tmp1, tmp2);

        // linear operation
        rk[i] = K[i + 4] = K[i] ^ (tmp2 ^ GM_CROL(tmp2, 13) ^ GM_CROL(tmp2, 23));
    }
}
void test_gm_sm4(const unsigned char * key, int mode,
    const unsigned char * input,
    const unsigned char * output_hex) {

    int i = 0;
    unsigned char buf[16] = {0};
    char res[33] = {0};

    memcpy(buf, input, 16);

    for(i = 0; i < 100000; i++) {
        gm_sm4_crypt(key, mode, buf, buf);
    }

    for (i = 0; i < 16; i++) {
        sprintf(res + i * 2, "%02X", (buf[i] & 0x0FF));
    }

    printf("r = %s\n", res);
    printf("test result: %s\n", (strcmp(reinterpret_cast<const char*>(output_hex), res) == 0 ? "ok" : "fail"));
}
